<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>留言板</title>
    <style>
        .container {
            width: 350px;
            height: 300px;
            margin: 0 auto;
            /* border: 1px black solid; */
            text-align: center;
        }

        .grey {
            color: grey;
        }

        .container .row {
            width: 350px;
            height: 40px;

            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .container .row input {
            width: 260px;
            height: 30px;
        }

        #submit {
            width: 350px;
            height: 40px;
            background-color: orange;
            color: white;
            border: none;
            margin: 10px;
            border-radius: 5px;
            font-size: 20px;
        }
    </style>
</head>

<body>
<div class="container">
    <h1>留言板</h1>
    <p class="grey">输入后点击提交, 会将信息显示下方空白处</p>
    <div class="row">
        <span>谁:</span> <input type="text" name="" id="from">
    </div>
    <div class="row">
        <span>对谁:</span> <input type="text" name="" id="to">
    </div>
    <div class="row">
        <span>说什么:</span> <input type="text" name="" id="message">
    </div>
    <input type="button" value="提交" id="submit" onclick="submit()">
    <!-- <div>A 对 B 说: hello</div> -->
</div>

<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.4/jquery.min.js"></script>
<script>
        $.ajax({
            url: "/message/getList",
            type: "get",
            success: function(messageInfos){
                var finalHtml = "";
                for(var message of messageInfos){
                    finalHtml += '<div>' + message.from + '对' + message.to + '说' + message.message + '</div>';
                    $(".container").append(finalHtml);
                }
            }
        });

        function submit(){
            //1. 获取留言的内容
            var from = $('#from').val();
            var to = $('#to').val();
            var message = $('#message').val();
            if (from== '' || to == '') {
                return;
            }

            // 发送 ajax 请求
            $.ajax({
                url: "/message/publish",
                type: "post",
                data: {
                    from: $('#from').val(),
                    to: $('#to').val(),
                    message: $('#message').val()
                },
                
                success: function(result){
                    if(result) {
                        //构造节点
                        var divE = '<div>' + from + '对' + to + '说' + message + '</div>';
                        //将节点添加到页面上
                        $(".container").append(divE);
                        //清空输入框的值
                        $('#from').val("");
                        $('#to').val("");
                        $('#message').val("");
                    }else{
                        alert("输入不合法");
                    }
                }
            });
        }

    </script>
</body>

</html>